This role-play is performed by adults. Ryota is living with his aunt and his wife as he attends a university outside the prefecture. He could no longer control his desires as his aunt, Saki, whom he had loved and admired for a long time, was in front of him. Ryota, filled with an unquenchable fever, comes up with the idea of masturbating Saki's underwear. She secretly sneaks into the changing room and buries her face in her freshly taken off panties. Ah... I can't stand it. At the moment when I inhaled the sweet and sour scent, unfortunately Saki saw me...